Hi

I had exactly the same error with my DTS which also contained a FTP Protocol task plus a Dyanmic Properties Task.

After much pain, I found (accidentally) that I had opened the DTS in Enterprise Manager on a PC that had a slightly different version of EM (think I put Sharepoint on it a while ago). The main difference being a dll called custtask.dll in C:\Program Files\Microsoft SQL Server\80\Tools\Binn folder.

On the original PC this was dated 17/12/2002, on the PC I had amended the package on it was 04/05/2005. Somehow after using the new EM it would never open again on PC with old EM (and kept giving the Unspecified error)

I did copy over new custtask.dll (after renaming original one) and it then also require a msvcr71.dll from Windows\System32 dir, but it did work! No registering dlls required. I got the package working again on the original PC. However in the end I worried too much about the effect of these new dll's on my other packages, that I ended up re-writing the FTP package on original old PC........... oh my